Peanut Butter Mug Cake

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5 from 78 votes
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This peanut butter mug cake recipe is moist, fluffy, and full of rich peanut butter flavor. Made with just three ingredients, it takes less than a minute to bake.

Love mug cake recipes? Try my almond flour mug cake, protein mug cake, or chocolate chip mug cake next.

peanut butter cake in a mug.

Everyone needs a go-to dessert that can be made with minimal effort when the cravings strike. My foolproof peanut butter mug cake recipe ticks those very boxes, and it’s become an almost nightly tradition!

Table of Contents
  1. Why I love this recipe
  2. Ingredients needed
  3. How to make a peanut butter mug cake
  4. Arman’s recipe tips
  5. More delicious mug cakes to try
  6. Peanut Butter Mug Cake (Recipe Card)

Why I love this recipe

  • It’s so darn easy. Just mix up your batter, pour it into your mug, and pop it in the microwave. It doesn’t get easier than this. 
  • Easy to customize. There’s plenty of room to customize this recipe so you can make it different every time.
  • Microwave and oven options. I prefer the microwave because it’s quick, but if I’m making mug cakes for the whole family, I always use the oven. 
  • Secretly healthy. Like my cinnamon roll in a mug, this mug cake has a decent amount of protein and minimal sugar, though you’d never guess by how tasty it is.

★★★★★ REVIEW 

“Love this cake! It’s easy, it’s delicious, and the texture is good too. I do use a brown sweetener in it and sometimes add a little cinnamon to it. But even without the cinnamon, it’s great!”Kristy

Ingredients needed

  • Peanut butter. Make sure the peanut butter you use has a smooth and drippy texture. I like to use all-natural smooth by Skippy’s or Trader Joe’s. Peanut butter can be swapped for any type of nut or seed butter, like sunflower seed butter, almond butter, or cashew butter.
  • Sugar. I used granulated white sugar, but if you’d prefer a more molasses flavor, use light brown sugar. Sugar substitutes will also work.
  • Egg. For moisture and to bind the dry ingredients.
  • Baking powder. It’s optional, but it gives the mug cake that extra fluffiness.
  • Mix-ins. I’ve included a ton of suggestions in the variations section.

How to make a peanut butter mug cake

I’ve included step-by-step photos below to make this recipe easy to follow at home. For the full printable recipe instructions and ingredient quantities, scroll to the recipe card at the bottom of this post.

Step 1- Make the batter. In a small mixing bowl, add all your ingredients and stir to combine. Transfer the batter to a greased large mug, ramekin, or shallow bowl. 

Step 2- Microwave. Microwave the mug cake for 45 seconds- 1 minute, or until a toothpick inserted comes out clean. Remove the cake from the microwave and let it sit for one minute before serving.

peanut butter mug cake.

How to make this in the oven

If you’d rather make the mug cake in the oven, it’s easy. Just preheat the oven to 350F/180C and grease a 6 or 8-inch ramekin with cooking spray. Make the batter, pour it into the ramekin, and bake for 8-10 minutes or until a toothpick comes out clean. 

Arman’s recipe tips

  • Avoid overcooking. Everyone’s microwave is different, so the cooking time may vary. I recommend checking the cake every 30 seconds, and if it’s not cooked after 1 minute, microwave it in 20-second bursts until it’s fully cooked. 
  • If you have a microwave safe cereal bowl, you can use that instead of a ramekin. This is a better option if you are worried that there may be overflow.
  • If the batter looks too thick, I like to add 1-2 tablespoons of almond milk.

Flavor variations

  • Peanut butter chocolate chip. Add 1-2 tablespoons of dark chocolate chips to the batter and on top of the mug cake. 
  • Chocolate peanut butter. Add 1-2 tablespoons of cocoa powder to the batter.
  • Peanut butter and jelly. Swirl 1-2 teaspoons of jelly into the batter.
  • Cut the carbs. For a low-carb version, swap out the sugar for allulose.
  • Add toppings. Top the fresh mug cake with whipped cream, vanilla ice cream, or caramel sauce. 
  • Enhance the flavor. Add a sprinkle of sea salt or ¼ teaspoon of vanilla extract.
peanut butter mug cake with chocolate chips.

More delicious mug cakes to try

peanut butter mug cake recipe.

Peanut Butter Mug Cake

5 from 78 votes
This peanut butter mug cake recipe is moist, fluffy, and full of rich peanut butter flavor. Made with just 3 ingredients, it takes less than a minute to bake.
Servings: 1 mug cake
Prep: 1 minute
Cook: 1 minute
Total: 2 minutes

Ingredients  

Instructions 

  • In a small mixing bowl, add all your ingredients and whisk together, until combined.
  • Transfer your mug cake batter into a greased microwave-safe ramekin or cereal bowl. Microwave for 45 seconds-1 minute. Remove from the microwave and let sit for a minute, before eating.

Oven Instructions

  • Preheat the oven to 180C/350F. Grease an oven-safe ramekin (6-8 inches) with oil. Make the batter before transferring to the ramekin. Bake for 8-10 minutes.

Nutrition

Serving: 1mug cakeCalories: 355kcalCarbohydrates: 10gProtein: 18gFat: 29gSodium: 535mgPotassium: 381mgFiber: 3gVitamin A: 270IUCalcium: 184mgIron: 2mgNET CARBS: 7g
Course: Dessert
Cuisine: American
Author: Arman Liew
Tried this recipe?Give us a shout at @thebigmansworld or tag #thebigmansworld!

Originally published October 2020, updated and republished April 2024

Arman Liew

I’m a two time cookbook author, photographer, and writer, and passionate about creating easy and healthier recipes. I believe you don’t need to be experienced in the kitchen to make good food using simple ingredients that most importantly, taste delicious.

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  1. 5 stars
    Hi Arman,
    Many of your recipes have become staples in my home, especially the keto’s. It’s hard to find keto recipes that work, with so few ingredients. The mug cakes not only taste great, but are filled with healthy nutrients as fiber and protein. I’ve been known to tweak a bit by adding nuts to some. These are all keepers to be download to my digital app: “My Recipe Box”, so they’re forever handy.
    With much gratitude, Jeannie

  2. 5 stars
    Love this cake! It’s easy, it’s delicious, and the texture is good too. I do use a brown sweetener in it, and sometimes add a little cinnamon to it. But even without the cinnamon, it’s great!

  3. 5 stars
    can’t wait to try these. Not only do they look delicious, but the ingredients are also inexpensive and fast to prepare and cook.
    This way I’m saving money and these days every little bit counts.
    Thank you so much
    Great Grandma on Social Security